Works fine, if you add a semicolon at the end.
```d
import std.stdio;
void main() {
string[][string] arr = [
"one": ["abc", "def"],
"two": ["ghi", "jkl"],
"three": ["mno", "pqr"]
];
writeln(arr);
writeln(arr["two"]);
writeln(arr["two"][0]);
}
```